<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script src="../js/vue.js"></script>
<div id="app">
    <h2>当前计数：{{counter}}</h2>
    <button v-on:click="add">+</button>
    <button v-on:click="sub">-</button>
</div>


<script>
    const obj = {
        counter: 0,
        message:'123'
    }
  const app = new Vue({
    el: '#app',
    data: obj,
    methods:{
      add:function (){
        console.log('add执行');
        this.counter++
      },
      sub:function (){
        console.log('sub执行');
        this.counter--
      }
    }
  })
</script>
</body>
</html>